Published advisory · ZDI-25-115

(0Day) Ashlar-Vellum Cobalt VS File Parsing Use of Uninitialized Variable Remote Code Execution Vulnerability

Published Rocco Calvi
CVSS severity 7.8/ 10.0 · High AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vulnerability analysis

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of VS files. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this vulnerability to execute code in the context of the current process.

Disclosure timeline

  1. Vulnerability reported to vendor
  2. Coordinated public release of advisory

References